The MSD Platinum 21 R is a 470 watt replacement bulb.

9281-978-05314 Specifications:

• Technology: High-intensity discharge
• Type: Metal Halide
• Watts: 470W
• Ends: Single-ended
• Overall Length: 60mm
• Diameter: 54.5mm
• Burning Position: Universal
• Arc Length: 1.2mm
• Initial Lumens: 23,000
• CC Temp: 8000 K 
• CRI: 80
• Life: 1500 hours
• Reflector: E21.4
• Working Distance: 59mm
• Pinch Temp: 450°C

This bulb works in many applications including the following: 

Fine ART Fine 470 Beam OD, Fine ART Fine 470 BSW OD, Elation Proteus Hybrid, PRG Icon EDGE, Terbly G20 Hybrid IP, Terbly G21 Hybrid, Elation Artiste V21BS, Elation Proteus Hybrid V21BS IP, Terbly G12WB, Elation Proteus Hybrid WMG PRH135, Elation Proteus Hybrid PRH021, Elation Artiste V21BS